Question

Q1: For each of the molecules determine the number of modes, the number of stretching modes, and the number of bending modes. For each molecule describe one oscillation-mode and justify why it is (is not) IR-active. a) H? b) HCl c) HCN (see below) d) AlF3 (analyse two modes: 1- a breathing mode, 2- where two F's 'swing' in a 'scissor-mode'). H C N 180° H C N

          Q1: For each of the molecules determine the number of modes, the number of
stretching modes, and the number of bending modes. For each molecule
describe one oscillation-mode and justify why it is (is not) IR-active.
a) H?
b) HCl
c) HCN (see below)
d) AlF3 (analyse two modes: 1- a breathing mode, 2- where two F's 'swing' in a
'scissor-mode').
H
C
N
180°
H
C
N

Q1: For each of the molecules determine the number of modes, the number of
stretching modes, and the number of bending modes. For each molecule
describe one oscillation-mode and justify why it is (is not) IR-active.
a) H?
b) HCl
c) HCN (see below)
d) AlF3 (analyse two modes: 1- a breathing mode, 2- where two F's 'swing' in a
'scissor-mode').
H
C
N
180°
H
C
N

Added by Jennifer B.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

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However, one degree of freedom is translational motion, and another is rotational motion, leaving only one vibrational mode. - Number of stretching modes: 0 (no stretching modes) - Number of bending modes: 0 (no bending modes) - Oscillation mode: In H2, the Show more…

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Q1: For each of the molecules, determine the number of modes, the number of stretching modes, and the number of bending modes. For each molecule, describe one oscillation mode and justify why it is (or is not) IR-active. a) H2 b) HCl c) HCN (see below) d) AlF3 (analyze two modes: 1 - a breathing mode, 2 - where two F's 'swing' in a scissor mode). H C N 180Â° H N